A much larger scale of a "tramp stamp". In order for a tattoo to qualify for the title of "tramp mural" it must start at the regular position for a "tramp stamp" and go no shorter than the elbows when rested at ones side. Tramp murals can only be sported by women, and if she has one the odds are shes been nailed by more than one carpenter if you know what i mean.

Guy 1: Dude, check out that chicks tramp stamp.
Dude: You idiot, you can clearly see by the starting and ending points that it is clearly a tramp mural.
Guy 1: Oh, so that means shes a-
Dude: Yep.